All on the Spectrum as it was the only 8-bit machine I owned with good games on it. I owned a Plus-4 which was sadly lacking in quality games despite having better colour and resolution capabilities than a C64.

Pitiful I dont had a C64 back at the eighties because I would include many, surely. I had a MSX but just some days with very crap games at 1984 or 85, but my computer was the Spectrum 48k+ during 8 years or approx.

Last Ninja II
Ghettoblaster
International Karate
Monty on the Run
Turrican
Turrican II
Last Ninja
Ghost'n'Goblins
Summer Games
Creatures
(Although not listed in the ten, others include Myth, Times of Lore, Project Steath Fighter, Bubble Bobble, Ghouls n Ghosts, Barbarian, Operation Wolf amongst others, way too many to list!)

You gotta be kidding. It's easier to list my top10 amiga games than my top10 8 bits games. All my fav games were on the 8 bits era.

Where should I begin?

Elite, Dig-Dug(Arc), Beamrider(MSX), Space Manbow(MSX), Gyruss(Arc), Moon Patrol(Arc), Eggerland Mystery(MSX), Adventure of Lolo(NES), Treasure of USAS (MSX), Aleste 1&2 (MSX), Zanac (NES), Soldier Blade(PC-Engine), The Castle(MSX), Salamander(Arc), Metal Gear(MSX), Bubble Bobble (Arc), Pitfall2 (Atari2600), Bank Panic(Arcade), Hype(MSX), Knightmare(MSX)... and I could go on for a while. And those aren't just games I think they are good, but games that I TRULY LOVE.

Most of the games listed as arcade games I probably played first in some home version (In most cases, the MSX version)

Some interesting games on other people list too.

The Lucky Dime Caper on Burseg's list: this is an awesome platform game that deserved to be more known.

Laser Squad on ManicX's list: Still one of the few strategy games I enjoy playing even today.

Lazy Jones on Mangar's list: OHH, I had hundred of hours of fun with this game. The music was great also.